Like everything else Nitrous system have moved on in the last 10 years.
Dont use a system with Solnoids as they cant be controlled well electronically, use a Pulsoid system like WON.

Mines a 1.06 & we have used 200bhp jets boosted by 1500psi Nitrogen push. It uses a 4 fogger system with a Controller so 60% start up to 100% in 1.6 seconds. The ECU controls it with 97% throttle being the start point & switches it off 100rpm below the limiter you can control it as you wish. We have perfected it over a 10 year period. It gives a Torque boost about the same as Power .
A heater will be required if 'push' is not used as pressure drops alarmingly.

The system below will do everything you want with full control.